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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName TRANSAMERICA FUNDS
Prospectus Date rr_ProspectusDate Mar. 01, 2020
Class I2 | Transamerica Small Cap Value  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Transamerica Small Cap Value
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock Seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses:
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover:
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the fund’s performance.

During the most recent fiscal year, the portfolio turnover rate for the fund was 168% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 168.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example:
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the fund for the time periods indicated and then redeem all shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies:
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The fund’s sub-adviser, Peregrine Capital Management, LLC (the “sub-adviser”) invests, under normal circumstances, at least 80% of the fund’s net assets (plus the amount of borrowings, if any, for investment purposes) in equity securities of small-capitalization companies. The fund generally considers a small-capitalization company to be a company with a market capitalization within the range of the Russell 2000® Value Index1 at the time of initial purchase. As of December 31, 2019, the market capitalization range of the Russell 2000® Value Index was between $16 million and $6.74 billion. The equity securities in which the fund invests are primarily common stocks of U.S. companies.

The sub-adviser uses a proprietary, quantitative screening process designed to identify the least expensive small cap stocks across each sector.  This screening process narrows the investment universe and allows the sub-adviser to focus its fundamental research and analysis on the stocks that the sub-adviser believes are the most undervalued relative to their respective sector peer group. Fundamental research is primarily conducted through financial statement analysis, meetings with company management teams, and interacting with sell-side research analysts. Through its fundamental research and analysis, the sub-adviser seeks to uncover one or more of the following five Value Buy Criteria that the sub-adviser believes may act as a catalyst for stock appreciation:
  • Resolvable Short-Term Problem – Companies that, although they may have gone through a negative fundamental event that has had an impact on stock price and valuation, the sub-adviser believes it is able to identify and understand the company’s pathway to resolve the problem within a reasonable period of time.
  • Catalyst for Change – Companies that may have a material fundamental event going on that the sub-adviser believes the market is not pricing in to the valuation of the stock.
  • Unrecognized Assets – Companies that the sub-adviser believes may have some intrinsic value that the market is not appreciating and the sub-adviser believes there is a pathway to unlocking that value within the near to moderate term.
  • Fundamental Undervaluation – Companies that the sub-adviser believes lack significant sponsorship from the sell-side community and often times have strong margins and growth but are in the 10-15% of the lowest valued names in a sector.
  • Take-Over Potential – Companies that the sub-adviser believes have assets that would be more attractive in the hands of other owners.
The sub-adviser may sell a stock when the sub-adviser believes it has become fairly valued or when signs of fundamental deterioration appear. The sub-adviser may actively trade portfolio securities.

From time to time, the fund may invest up to 10% of its assets in exchange-traded funds (“ETFs”) in order to manage market liquidity and equitize cash. The fund may also invest some of its assets in cash or in money market instruments, including U.S. Government obligations and repurchase agreements, or make other short-term debt investments to maintain liquidity.

1 “Russell®” and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.
Risk [Heading] rr_RiskHeading Principal Risks:
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock Risk is inherent in all investing. Many factors and risks affect the fund's performance, including those described below. The value of your investment in the fund, as well as the amount of return you receive on your investment, may fluctuate significantly day to day and over time. You may lose part or all of your investment in the fund or your investment may not perform as well as other similar investments. The following is a summary description of principal risks (in alphabetical order after certain key risks) of investing in the fund. An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. You may lose money if you invest in this fund.

Market – The market prices of the fund's securities may go up or down, sometimes rapidly or unpredictably, due to general market conditions, such as overall economic trends or events, government actions or interventions, market disruptions caused by trade disputes or other factors, political factors or adverse investor sentiment. The market prices of securities also may go down due to events or conditions that affect particular sectors, industries or issuers. Adverse market conditions may be prolonged and may not have the same impact on all types of securities. If the market prices of the securities owned by the fund fall, the value of your investment will go down. The fund may experience a substantial or complete loss on any individual security.

Economies and financial markets throughout the world are increasingly interconnected. Economic, financial or political events, trading and tariff arrangements, terrorism, technology and data interruptions, natural disasters and other circumstances in one country or region could be highly disruptive to, and have profound impacts on, global economies or markets. During periods of market disruption, the fund's exposure to the risks described elsewhere in this summary will likely increase. As a result, whether or not the fund invests in securities of issuers located in or with significant exposure to the countries directly affected, the value and liquidity of the fund's investments may be negatively affected.

Value Investing – The prices of securities the sub-adviser believes are undervalued may not appreciate as anticipated or may go down. The value approach to investing involves the risk that stocks may remain undervalued, undervaluation may become more severe, or perceived undervaluation may actually represent intrinsic value. Value stocks as a group may be out of favor and underperform the overall equity market for a long period of time, for example, while the market favors “growth” stocks.

Small Capitalization Companies – The fund will be exposed to additional risks as a result of its investments in the securities of small capitalization companies. Small capitalization companies may be more at risk than larger capitalization companies because, among other things, they may have limited product lines, operating history, market or financial resources, or because they may depend on limited management groups. The prices of securities of small capitalization companies generally are more volatile than those of larger capitalization companies and are more likely to be adversely affected than larger capitalization companies by changes in earnings results and investor expectations or poor economic or market conditions. Securities of small capitalization companies may underperform larger capitalization companies, may be harder to sell at times and at prices the portfolio managers believe appropriate and may offer greater potential for losses.

Equity Securities – Equity securities represent an ownership interest in an issuer, rank junior in a company’s capital structure and consequently may entail greater risk of loss than debt securities. Equity securities include common and preferred stocks. Stock markets are volatile and the value of equity securities may go up or down sometimes rapidly and unpredictably. Equity securities may have greater price volatility than other asset classes, such as fixed income securities. The value of equity securities fluctuates based on changes in a company’s financial condition, factors affecting a particular industry or industries, and overall market and economic conditions. If the market prices of the equity securities owned by the fund fall, the value of your investment in the fund will decline. If the fund holds equity securities in a company that becomes insolvent, the fund’s interests in the company will rank junior in priority to the interests of debtholders and general creditors of the company, and the fund may lose its entire investment in the company.

Liquidity – The fund may make investments that are illiquid or that become illiquid after purchase. Illiquid investments can be difficult to value, may trade at a discount from comparable, more liquid investments, and may be subject to wide fluctuations in value. As a general matter, a reduction in the willingness or ability of dealers and other institutional investors to make markets in fixed income securities may result in even less liquidity in certain markets. If the fund is forced to sell an illiquid investment to meet redemption requests or other cash needs, the fund may be forced to sell at a loss. The fund may not receive its proceeds from the sale of less liquid or illiquid securities for an extended period (for example, several weeks or even longer), and such sale may involve additional costs. Liquidity of particular investments, or even an entire market segment, can deteriorate rapidly, particularly during times of market turmoil, and those investments may be difficult or impossible for the fund to sell. This may prevent the fund from limiting losses.

Valuation – The sales price the fund could receive for any particular portfolio investment may differ from the fund's valuation of the investment, particularly for securities that trade in thin or volatile markets, that are priced based upon valuations provided by third-party pricing services that use matrix or evaluated pricing systems, or that are valued using a fair value methodology. Investors who purchase or redeem fund shares on days when the fund is holding fair-valued securities may receive fewer or more shares or lower or higher redemption proceeds than they would have received if the fund had not fair-valued securities or had used a different valuation methodology. The fund's ability to value its investments may be impacted by technological issues and/or errors by pricing services or other third party service providers.

Management – The value of your investment may go down if the investment manager’s or sub-adviser's judgments and decisions are incorrect or otherwise do not produce the desired results. You may also suffer losses if there are imperfections, errors or limitations in the quantitative, analytic or other tools, resources, information and data used, investment techniques applied, or the analyses employed or relied on, by the investment manager or sub-adviser, if such tools, resources, information or data are used incorrectly or otherwise do not work as intended, or if the investment manager’s or sub-adviser's investment style is out of favor or otherwise fails to produce the desired results. The fund’s investment strategies may not work as intended or otherwise fail to produce the desired results. Any of these things could cause the fund to lose value or its results to lag relevant benchmarks or other funds with similar objectives.

Active Trading – The fund may purchase and sell securities without regard to the length of time held. Active trading may have a negative impact on performance by increasing transaction costs and may generate greater amounts of net short-term capital gains, which, for shareholders holding shares in taxable accounts, would generally be subject to tax at ordinary income tax rates upon distribution. During periods of market volatility, active trading may be more pronounced.

Investments by Affiliated Funds and Unaffiliated Funds – A significant portion of the fund’s shares may be owned by other funds sponsored by Transamerica and/or parties not affiliated with Transamerica. Transactions by these funds may be disruptive to the management of the fund. For example, the fund may experience large redemptions and could be required to sell securities at a time when it may not otherwise desire to do so. Such transactions may increase the fund’s brokerage and/or other transaction costs and could also accelerate the realization of taxable capital gains in the fund. In addition, sizeable redemptions could cause the fund’s total expenses to increase.

Underlying Exchange-Traded Funds – To the extent the fund invests its assets in underlying ETFs, its ability to achieve its investment objective will depend in part on the performance of the underlying ETFs in which it invests. Investing in underlying ETFs subjects the fund to the risks of investing in the underlying securities or assets held by those ETFs. Each of the underlying ETFs in which the fund may invest has its own investment risks, and those risks can affect the value of the underlying ETFs’ shares and therefore the value of the fund's investments. There can be no assurance that the investment objective of any underlying ETF will be achieved. To the extent that the fund invests more of its assets in one underlying ETF than in another, the fund will have greater exposure to the risks of that underlying ETF. In addition, the fund will bear a pro rata portion of the operating expenses of the underlying ETFs in which it invests.

Equity-based ETFs are subject to risks similar to those of stocks; fixed income-based ETFs are subject to risks similar to those of fixed-income securities. An investment in an ETF generally presents the same primary risks as an investment in a conventional fund (i.e., one that is not exchange-traded) that has the same investment objectives, strategies and policies. The price of an ETF can fluctuate up and down, and the fund could lose money investing in an ETF if the prices of the securities owned by the ETF go down. In addition, ETFs are subject to certain risks that do not apply to conventional funds, including: (i) the market price of an ETF’s shares may be above or below the shares’ net asset value; (ii) during periods of market volatility, the share prices of ETFs may deviate significantly from their NAVs; (iii) an active trading market for an ETF’s shares may not develop or be maintained; (iv) trading of an ETF’s shares may be halted if the listing exchange’s officials deem such action appropriate, the shares are delisted from the exchange, the activation of market-wide “circuit breakers” (which are tied to large decreases in stock prices) halts stock trading generally, or trading in one or more of the ETF’s underlying securities is halted, which could result in the ETF being more volatile; or (v) a limited number of institutions may act as authorized participants to create or redeem block-sized units of ETF shares. In the event substantial market or other disruptions affecting ETFs should occur in the future, the liquidity and value of the fund's shares could also be substantially and adversely affected.
Risk Lose Money [Text] rr_RiskLoseMoney You may lose money if you invest in this fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance:
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The bar chart and the table below provide some indication of the risks of investing in the fund. The bar chart shows how the fund’s performance has varied from year to year. The table shows how the fund’s average annual total returns for different periods compare to the returns of a broad measure of market performance.

The fund acquired the assets and assumed the liabilities of three Transamerica Partners funds, including Transamerica Partners Institutional Small Value (the “predecessor fund”), on April 21, 2017, and the predecessor fund was the accounting and performance survivor of the reorganizations. This means that the predecessor fund’s financial and performance history became the financial and performance history of the fund. In the reorganizations, former shareholders of the predecessor fund received Class R4 shares of the fund. The performance shown in the bar chart is for Class R4 shares, which are offered in a separate prospectus. The performance for Class R4 shares includes the performance of the predecessor fund prior to the reorganizations, and has not been restated to reflect the annual operating expenses of Class R4 shares. The returns for Class I2 shares will differ from Class R4 shares to the extent the classes have different expenses.

As with all mutual funds, past performance (before and after taxes) is not a prediction of future results. Updated performance information is available on our website at www.transamerica.com/individual/products/mutual-funds/performance/ or by calling 1-888-233-4339.

Prior to July 9, 2010, a different sub-adviser managed the predecessor fund and it used different investment strategies. The performance set forth for the period prior to that date is attributable to that previous sub-adviser.

Prior to September 28, 2015, the predecessor fund had a different sub-adviser, a different investment objective and used different investment strategies. The performance set forth for the period between July 9, 2010 and September 27, 2015 is attributable to that previous sub-adviser.

Prior to November 1, 2018, the fund had a different sub-adviser and used different investment strategies. The performance set forth for the period between September 28, 2015 and October 31, 2018 is attributable to that previous sub-adviser.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and the table below provide some indication of the risks of investing in the fund. The bar chart shows how the fund’s performance has varied from year to year. The table shows how the fund’s average annual total returns for different periods compare to the returns of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-888-233-4339
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.transamerica.com/individual/products/mutual-funds/performance/
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As with all mutual funds, past performance (before and after taxes) is not a prediction of future results.
Bar Chart [Heading] rr_BarChartHeading Annual Total Returns (calendar years ended December 31) - Class R4
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
  Quarter Ended Return
Best Quarter: 12/31/2011 17.69%
Worst Quarter: 12/31/2018 -20.04%
Bar Chart, Returns for Class Not Offered in Prospectus [Text] rr_BarChartReturnsForClassNotOfferedInProspectus The performance shown in the bar chart is for Class R4 shares, which are offered in a separate prospectus. The returns for Class I2 shares will differ from Class R4 shares to the extent the classes have different expenses.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (periods ended December 31, 2019)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns are calculated using the historic highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns may depend on the investor’s individual tax situation and may differ from those shown. After-tax returns may not be relevant if the investment is made through a tax-exempt or tax-deferred account, such as a 401(k) plan.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The after-tax returns are calculated using the historic highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns may depend on the investor’s individual tax situation and may differ from those shown. After-tax returns may not be relevant if the investment is made through a tax-exempt or tax-deferred account, such as a 401(k) plan.
Class I2 | Transamerica Small Cap Value | I2  
Risk/Return: rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is lower) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.80%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.10%
Total annual fund operating expenses rr_ExpensesOverAssets 0.90%
1 year rr_ExpenseExampleYear01 $ 92
3 years rr_ExpenseExampleYear03 287
5 years rr_ExpenseExampleYear05 498
10 years rr_ExpenseExampleYear10 $ 1,108
1 Year rr_AverageAnnualReturnYear01 21.05% [1]
Since Inception rr_AverageAnnualReturnSinceInception 2.82% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 21, 2017 [1]
Class I2 | Transamerica Small Cap Value | Class R4  
Risk/Return: rr_RiskReturnAbstract  
2010 rr_AnnualReturn2010 22.86%
2011 rr_AnnualReturn2011 1.11%
2012 rr_AnnualReturn2012 15.81%
2013 rr_AnnualReturn2013 33.88%
2014 rr_AnnualReturn2014 7.08%
2015 rr_AnnualReturn2015 (6.33%)
2016 rr_AnnualReturn2016 19.24%
2017 rr_AnnualReturn2017 8.44%
2018 rr_AnnualReturn2018 (18.95%)
2019 rr_AnnualReturn2019 20.74%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2011
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.69%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (20.04%)
Class I2 | Transamerica Small Cap Value | Return after taxes on distributions | I2  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 19.88% [1]
Since Inception rr_AverageAnnualReturnSinceInception 1.15% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 21, 2017 [1]
Class I2 | Transamerica Small Cap Value | Return after taxes on distributions and sale of fund shares | I2  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 13.30% [1]
Since Inception rr_AverageAnnualReturnSinceInception 2.04% [1]
Inception Date rr_AverageAnnualReturnInceptionDate Apr. 21, 2017 [1]
Class I2 | Transamerica Small Cap Value | Russell 2000® Value Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 22.39% [2]
Since Inception rr_AverageAnnualReturnSinceInception 5.53% [2]
[1] Class I2 shares of the fund commenced operations on April 30, 2012. Performance information is shown for one year and from the date of the reorganizations (April 21, 2017). The predecessor fund, whose accounting and performance history were adopted in the reorganizations, did not offer Class I2 shares.
[2] “Russell®” and other service marks and trademarks related to the Russell indexes are trademarks of the London Stock Exchange Group companies.